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Lithium ion battery negative material structure and preparation method thereof

A technology of lithium ion battery and negative electrode material, applied in battery electrodes, secondary batteries, structural parts, etc., can solve the problems of particle crushing, volume expansion, pulverization, etc., and achieve the effect of good electrochemical performance

Active Publication Date: 2014-07-02
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problems of rapid volume expansion in the lithium intercalation process of silicon-based materials, particle breakage and pulverization in the cycle process, and falling off from the current collector, and provide a structure and preparation method of a negative electrode material for lithium-ion batteries

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  • Lithium ion battery negative material structure and preparation method thereof
  • Lithium ion battery negative material structure and preparation method thereof
  • Lithium ion battery negative material structure and preparation method thereof

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specific Embodiment approach 1

[0026] Specific Embodiment 1: In this embodiment, the structure of a negative electrode material for a lithium ion battery is a hollow pomegranate structure wrapped with one-dimensional linear carbon, the outer structure is one-dimensional linear carbon, and the inner structure is an empty pomegranate structure.

[0027] The lithium-ion battery negative electrode material of this embodiment is characterized in that: the entire particle size is micron or submicron, the external structure is one-dimensional linear carbon, and the internal structure is a hollow pomegranate structure; inside the particle, there are many silicon particles with a diameter of about 10 nm. Accumulate to form the core of the hollow pomegranate structure, and the 5-100nm thick carbon layer forms the shell of the hollow pomegranate structure. One side of the core is in contact with the carbon shell, and the other side is an empty volume; outside the particle, many one-dimensional lines are buried on the ca...

specific Embodiment approach 2

[0028] Specific embodiment two: the difference between this embodiment and specific embodiment one is: the hollow pomegranate structure in the structure of the negative electrode material of the lithium ion battery is composed of a core formed by silicon particles and a shell composed of a carbon layer. Dimensional linear carbon is embedded on the shell, in which the diameter of silicon particles is 8-15nm, and the thickness of the carbon layer is 5-100nm. Others are the same as the first embodiment.

specific Embodiment approach 3

[0029] Embodiment 3: This embodiment differs from Embodiment 1 or Embodiment 2 in that the core formed by the accumulation of silicon particles occupies 10% to 80% of the volume of the pomegranate structure. Others are the same as those in Embodiment 1 or 2.

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Abstract

The invention relates to a lithium ion battery negative material structure and a preparation method thereof, which aim at solving the problems that the size of a silicon-based material is rapidly swelled in the lithium intercalation process, and particles are crushed and powdered in the cycling process and dropped off from a current collector. The structure is a one-dimensional linear carbon-cladding empty pomegranate structure. The preparation method comprises the following steps of I, adding silicon oxide SiOx particles, one-dimensional linear carbon, a surface active agent, a pH adjusting agent and polymer monomer into an ethanol aqueous solution to be ultrasonically dispersed; II, preparing a polymerization initiator solution; III, preparing an SiOx carbon precursor / one-dimensional carbon; and IV, preparing SiOxC / one-dimensional carbon, adding the SiOxC / one-dimensional carbon into the ethanol aqueous solution to be dispersed, adding a non-oxidized acid and HF mixed solution, and washing, filtering, crushing and filtering after the reaction. The lithium ion battery negative material structure has good electrochemical performance and is applied to the field of electrochemical power supplies.

Description

technical field [0001] The invention relates to a structure of a negative electrode material of a lithium ion battery and a preparation method thereof. Background technique [0002] In recent years, with the rapid development of portable electronic devices, communication devices, and electric vehicles, there is an urgent need to increase the energy density of lithium-ion batteries. However, the theoretical specific capacity of graphite-based carbon anode materials widely used at present is only 372 mAh / g, which is far from meeting the demand. Silicon-based materials are considered to be the most promising anode materials for next-generation lithium-ion batteries due to their high lithium intercalation capacity. However, the volume change of more than 300% in the process of lithium intercalation and desorption of silicon-based materials makes it crack, pulverize, and fall off during charging and discharging, resulting in a sharp drop in battery cycle performance. Nanomateri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/38
CPCH01M4/366H01M4/386H01M4/625H01M10/0525Y02E60/10
Inventor 杜春雨陈桂林尹鸽平左朋建程新群马玉林高云智
Owner HARBIN INST OF TECH
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